Green Roof Granular Drainage

Green roof systems of this type are drained by a base layer of lightweight inorganic granular media.

Green roof granular drainage.

Systems with granular drainage description. Green roof drainage system of all the choices the owner or specifier has to make when designing a green roof drainage system the choice of waterproofing is easy. Excess water spills over the edges of the plates and is carried off the roof. To maximize water storage and minimize weight the granular media should contain a significant percentage of porous material such as heat expanded rock.

The grs gr52 panel size is 24 x 24 x 2 125. A granular drainage layer that can be easily adjusted for any area or depth for extensive semi intensive or intensive green roofs in multi course systems promotes healthy plant growth by retaining draining water in a natural way provides a more natural root space with better water air distribution than synthetic options. Green roof drain boxes optigreen drain boxes prevent soil and granular drainage media from entering roof drains but allow water to flow freely through slots covering the sides and top. The hyproof membrane is a high performance coal tar elastomeric membrane ctem.

Description green roof systems of this type are drained by waffled plastic sheets called drainage plates. Green roof solutions gr32 and gr52 drainage panels come in 24 x 24 interlocking squares constructed of 100 recycled high density polypropylene hdpp. The gr52 can withstand 0 352 gallons per square foot or 1 4 gallons per panel. However its water storage and drainage capacity is limited so it is primarily used for sloped roofs not suitable for drainage type p or type g.